Patents by Inventor Peter Capofreddi
Peter Capofreddi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9170593Abstract: Devices and methods are provided for generating a regulated output voltage with improved line rejection based on an input voltage and a reference voltage. The device may include a pass transistor and a replica transistor, wherein source ports of the pass transistor and the replica transistor are coupled to the input voltage, a drain port of the pass transistor is coupled to the output voltage, and a gate port of the pass transistor is coupled to a gate port of the replica transistor. The device may further include a coupling circuit configured to couple current from the drain port of the replica transistor to the gate port of the replica transistor, the coupling circuit further configured to control voltage on the drain port of the replica transistor based on the reference voltage.Type: GrantFiled: May 16, 2013Date of Patent: October 27, 2015Assignee: Fairchild Semiconductor CorporationInventor: Peter Capofreddi
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Publication number: 20140340060Abstract: Devices and methods are provided for generating a regulated output voltage with improved line rejection based on an input voltage and a reference voltage. The device may include a pass transistor and a replica transistor, wherein source ports of the pass transistor and the replica transistor are coupled to the input voltage, a drain port of the pass transistor is coupled to the output voltage, and a gate port of the pass transistor is coupled to a gate port of the replica transistor. The device may further include a coupling circuit configured to couple current from the drain port of the replica transistor to the gate port of the replica transistor, the coupling circuit further configured to control voltage on the drain port of the replica transistor based on the reference voltage.Type: ApplicationFiled: May 16, 2013Publication date: November 20, 2014Inventor: Peter Capofreddi
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Patent number: 8774738Abstract: Embodiments of the present disclosure provide systems and methods for estimating gain and phase error in a wireless transmitter. Embodiments of the present disclosure provide a gain and phase controller that uses a digital gain and phase estimator to jointly estimate both gain and phase. The forward and feedback signals of a wireless transmitter are digitized using analog to digital (ADC) converters. The digital signals are correlated with each other to dynamically extract gain and phase estimates of the loop. The gain and phase estimates are used to correct gain and phase errors in the wireless transmitter.Type: GrantFiled: April 20, 2012Date of Patent: July 8, 2014Assignee: Broadcom CorporationInventors: Sriraman Dakshinamurthy, Mohamed Mostafa, Derek Shaeffer, Dennis Pu, Peter Capofreddi
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Publication number: 20130320954Abstract: Devices, systems and methods are provided for a switched-mode voltage converter system with energy recovery. The device may include a first voltage converter circuit including a boost voltage node and an output voltage port coupled to a load. The first voltage converter circuit configured to deliver energy from the boost voltage node to the load in a first mode, and to deliver energy from the load to the boost voltage node in a second mode. The device may also include a second voltage converter circuit coupled to an energy source and to the boost voltage node, the second voltage converter circuit configured to convert a first voltage associated with the energy source to a second voltage associated with the boost voltage node.Type: ApplicationFiled: May 6, 2013Publication date: December 5, 2013Applicant: Fairchild Semiconductor CorporationInventors: Peter Capofreddi, Timothy Alan Dhuyvetter, Nicholas Stinson
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Patent number: 8503952Abstract: A method and apparatus of compensating for an asymmetric frequency response of a radio are disclosed. One method includes estimating a slope control signal, the slope control signal indicating a slope of a frequency response of an amplifier chain of the radio. A difference between gain at positive frequencies and gain at negative frequencies of a complex baseband signal is adjusted with the slope control signal, wherein the complex signal includes an I component and a Q component. The adjusted complex baseband signal is frequency up-converted into a radio signal. The radio signal is amplified by the amplifier chain. The amplified radio signal is transmitted.Type: GrantFiled: April 10, 2008Date of Patent: August 6, 2013Assignee: Broadcom CorporationInventors: Peter Capofreddi, Sriraman Dakshinamurthy, Derek Shaeffer
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Publication number: 20120270511Abstract: Embodiments of the present disclosure provide systems and methods for estimating gain and phase error in a wireless transmitter. Embodiments of the present disclosure provide a gain and phase controller that uses a digital gain and phase estimator to jointly estimate both gain and phase. The forward and feedback signals of a wireless transmitter are digitized using analog to digital (ADC) converters. The digital signals are correlated with each other to dynamically extract gain and phase estimates of the loop. The gain and phase estimates are used to correct gain and phase errors in the wireless transmitter.Type: ApplicationFiled: April 20, 2012Publication date: October 25, 2012Applicant: Broadcom CorporationInventors: Sriraman DAKSHINAMURTHY, Mohamed Mostafa, Derek Shaeffer, Dennis Pu, Peter Capofreddi
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Publication number: 20090258615Abstract: A method and apparatus of compensating for an asymmetric frequency response of a radio are disclosed. One method includes estimating a slope control signal, the slope control signal indicating a slope of a frequency response of an amplifier chain of the radio. A difference between gain at positive frequencies and gain at negative frequencies of a complex baseband signal is adjusted with the slope control signal, wherein the complex signal includes an I component and a Q component. The adjusted complex baseband signal is frequency up-converted into a radio signal. The radio signal is amplified by the amplifier chain. The amplified radio signal is transmitted.Type: ApplicationFiled: April 10, 2008Publication date: October 15, 2009Inventors: Peter Capofreddi, Sriraman Dakshinamurthy, Derek Shaeffer
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Patent number: 7308032Abstract: A method and a device for spectrally shaping nonlinear intersymbol interference (NLISI) in an oversampling digital-to-analog converter are disclosed. At least one higher-order shaper circuit is provided, so as to shape NLISI, causing energy associated with NLISI to fall outside a signal band. The signal-to-noise ratio achieved is better than signal-to-noise rations obtained in prior art NLISI reducing methods and devices.Type: GrantFiled: December 31, 2003Date of Patent: December 11, 2007Assignee: HRL Laboratories, LLCInventor: Peter Capofreddi
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Patent number: 7295068Abstract: A transconductance cell is disclosed that includes a first transistor and a second transistor. A regulator regulates an average voltage in response to a reference voltage, where the average voltage corresponds to the average of a voltage at a bias terminal of the first transistor and a voltage at a bias terminal of the second transistor. A mixer including the transconductance cell is also disclosed. In the mixer, the transconductance cell receives a differential input voltage and produces a differential output current. The mixer also includes one or more switches that multiply the differential output current with an oscillator signal. A method is disclosed that includes measuring an average voltage of a voltage at a bias terminal of a first transistor and a voltage at a bias terminal of a second transistor and regulating the average voltage responsive to the measured average voltage and a reference voltage.Type: GrantFiled: May 19, 2005Date of Patent: November 13, 2007Assignee: Beceem Communications Inc.Inventors: Peter Capofreddi, Arvin Ramesh Shahani, Derek Shaeffer, Korhan Titizer
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Patent number: 7164313Abstract: Circuits, methods, and systems are provided for opening a primary feedback loop in a transmitter. An auxiliary feedback loop can be closed when the primary feedback loop is opened, and a controller can match a gain of the primary feedback loop to another gain in the transmitter.Type: GrantFiled: November 12, 2004Date of Patent: January 16, 2007Assignee: Aspendos CommunicationsInventors: Peter Capofreddi, Derek K. Shaeffer, Sriraman Dakshinamurthy, Korhan Titizer
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Publication number: 20060261894Abstract: A transconductance cell is disclosed that includes a first transistor and a second transistor. A regulator regulates an average voltage in response to a reference voltage, where the average voltage corresponds to the average of a voltage at a bias terminal of the first transistor and a voltage at a bias terminal of the second transistor. A mixer including the transconductance cell is also disclosed. In the mixer, the transconductance cell receives a differential input voltage and produces a differential output current. The mixer also includes one or more switches that multiply the differential output current with an oscillator signal. A method is disclosed that includes measuring an average voltage of a voltage at a bias terminal of a first transistor and a voltage at a bias terminal of a second transistor and regulating the average voltage responsive to the measured average voltage and a reference voltage.Type: ApplicationFiled: May 19, 2005Publication date: November 23, 2006Applicant: Aspendos CommunicationsInventors: Peter Capofreddi, Arvin Shahani, Derek Shaeffer, Korhan Titizer
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Patent number: 7132885Abstract: A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or more cascaded amplifier stages and one or more bypass amplifier stages. The bypass amplifier stages are connected in parallel with the cascaded amplifier stages.Type: GrantFiled: March 23, 2005Date of Patent: November 7, 2006Assignee: Aspendos CommunicationsInventors: Peter Capofreddi, Derek K. Shaeffer, Korhan Titizer
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Publication number: 20060226901Abstract: A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or more cascaded amplifier stages and one or more bypass amplifier stages. The bypass amplifier stages are connected in parallel with the cascaded amplifier stages.Type: ApplicationFiled: March 23, 2005Publication date: October 12, 2006Inventors: Peter Capofreddi, Derek Shaeffer, Korhan Titizer
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Publication number: 20060103462Abstract: Circuits, methods, and systems are provided for opening a primary feedback loop in a transmitter. An auxiliary feedback loop can be closed when the primary feedback loop is opened, and a controller can match a gain of the primary feedback loop to another gain in the transmitter.Type: ApplicationFiled: November 12, 2004Publication date: May 18, 2006Inventors: Peter Capofreddi, Derek Shaeffer, Sriraman Dakshinamurthy, Korhan Titizer
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Publication number: 20050141659Abstract: A method and a device for spectrally shaping nonlinear intersymbol interference (NLISI) in an oversampling digital-to-analog converter are disclosed. At least one higher-order shaper circuit is provided, so as to shape NLISI, causing energy associated with NLISI to fall outside a signal band. The signal-to-noise ratio achieved is better than signal-to-noise rations obtained in prior art NLISI reducing methods and devices.Type: ApplicationFiled: December 31, 2003Publication date: June 30, 2005Inventor: Peter Capofreddi
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Patent number: 6703892Abstract: An apparatus for coupling a wideband current signal between two different potentials. The apparatus incorporates a capacitor for providing a signal path for a high frequency signal from a first potential to a second potential. The apparatus further incorporates a current mirror for providing a signal path to a low frequency signal from the first potential to the second potential.Type: GrantFiled: September 6, 2002Date of Patent: March 9, 2004Assignee: Santel Networks, Inc.Inventors: Peter Capofreddi, Anu Pisipaty
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Patent number: 6553398Abstract: An analog FIR filter that processes multiple output samples in parallel is disclosed. The simultaneous parallel processing of multiple samples permits improved sampling rate and improved accuracy as compared to prior art filters.Type: GrantFiled: September 19, 2001Date of Patent: April 22, 2003Assignee: Santel Networks, Inc.Inventor: Peter Capofreddi
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Patent number: 6542104Abstract: An improved thermometer-to-binary coder in which the bits of the thermometer code are used to directly generate the binary code without using an intermediate one-hot code.Type: GrantFiled: October 22, 2001Date of Patent: April 1, 2003Assignee: Santel Networks, Inc.Inventor: Peter Capofreddi
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Patent number: 6529926Abstract: An analog discrete-time filter that processes multiple output samples in parallel is disclosed. The simultaneous parallel processing of multiple samples permits improved sampling rate and improved accuracy as compared to prior art filters.Type: GrantFiled: September 20, 2000Date of Patent: March 4, 2003Assignee: Santel Networks, Inc.Inventor: Peter Capofreddi
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Publication number: 20020062329Abstract: An analog FIR filter that processes multiple output samples in parallel is disclosed. The simultaneous parallel processing of multiple samples permits improved sampling rate and improved accuracy as compared to prior art filters.Type: ApplicationFiled: September 19, 2001Publication date: May 23, 2002Inventor: Peter Capofreddi